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System and method for seamless handoff of WLAN-UMTS interworking

a technology of wlan and interworking, applied in the field of handoff between heterogeneous networks, can solve the problems of considerable delay and packet loss, inflexible application, pre-registration handoff scheme, etc., and achieve the effect of fast and seamless hando

Active Publication Date: 2008-06-24
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]To substantially solve at least the above problems and / or disadvantages, aspects of the present invention provide a system and method capable of providing fast, seamless handoff during WLAN-UMTS interworking.
[0014]Another aspect of the present invention provides a system and method for performing pre-registration and pre-authentication processes before occurrence of handoff in order to solve the delay problem occurring during handoff from a WLAN network to a UMTS network.
[0015]Another aspect of the present invention provides a system and method for reducing packet loss during handoff, using a scheme that buffers packets being delivered to an MN during a handoff period, then delivering the buffered packet to the MN upon completion of the handoff.

Problems solved by technology

The pre-registration handoff scheme, which operates based on Mobile IP, is not flexible when applied to a WLAN-UMTS interworking configuration, and must be adapted to perform an actual handoff process in WLAN and UMTS networks, as well as meet the requirements of the networks.
This causes a considerable delay and packet loss problem during actual handoff between the WLAN and UMTS networks.

Method used

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Examples

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first exemplary embodiment

[0045]In a first exemplary embodiment of the present invention, a UE 201 performs a pre-registration handoff process of collectively performing authentication, IP address allocation and registration through a Pre-Registration Request message.

[0046]FIG. 3 depicts a signaling diagram illustrating the overall operation in which a UE 201 performs pre-registration handoff from a WLAN AN 210 to a UMTS network 250, according to a first exemplary embodiment of the present invention. Referring to FIG. 3, packet exchange between a WLAN AN 210 and a HA 215 is performed in step 300. If a UE 201 determines that the handoff is in response to an L2 trigger, step 302, the UE 201 delivers a Pre-Registration Request message for requesting pre-authentication and pre-registration to an SGSN 208 via a GGSN / FA 209 of a UMTS network 250 through a WLAN AN 210, step 304. Herein, the Pre-Registration Request message includes such information as an IPUE and an IMSI of the UE 201, and the WLAN AN 210 holds add...

second exemplary embodiment

[0058]In a second exemplary embodiment of the present invention, a UE 201 first performs a pre-authentication process through Pre-Authentication Request / Response messages, then performs a pre-registration process through Pre-Registration Request / Response messages after completion of the pre-authentication process.

[0059]FIG. 4 depicts a signaling diagram illustrating the overall operation in which a UE 201 performs pre-registration handoff from a WLAN AN 210 to a UMTS network 250, according to a second exemplary embodiment of the present invention. Referring to FIG. 4, packet exchange between a UE 201, with an IPWLAN located in a WLAN AN 210, and a HA 215 is performed in step 400. If the UE 201 determines that the handoff is in response to an L2 trigger, step 402, the UE 201 delivers a Pre-Authentication Request message for requesting pre-authentication to an SGSN 208 via the WLAN AN 210 and a GGSN / FA 209, step 409. The Pre-Authentication Request message includes an IPUE and an IMSI ...

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Abstract

A seamless handoff system and method reduces delay and packet loss during handoff of user equipment (UE) from a Wireless Local Area Network (WLAN) network to a Universal Mobile Telecommunication System (UMTS) network. The handoff system and method performs pre-registration and pre-authentication processes before the occurrence of a handoff, buffers packets being delivered to a UE during a handoff period, and forwards the buffered packets to the UE after completion of the handoff, thereby reducing packet loss that can occur during handoff.

Description

PRIORITY[0001]This application claims the benefit under 35 U.S.C. § 119(a) of Korean Patent Application No. 2004-98232, filed Nov. 26, 2004 in the Korean Intellectual Property Office, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to handoff between heterogeneous networks. More particularly, the present invention relates to a handoff method for improving delay and packet loss which may frequently occur when a mobile node (MN) performs handoff from a Wireless Local Area Network (WLAN) network to a Universal Mobile Telecommunication System (UMTS) network.[0004]2. Description of the Related Art[0005]Mobile (Internet Protocol (IP)) Working Group of Internet Engineering Task Force (IETF), an international standardization organization, proposes a pre-registration handoff method as one of the methods capable of supporting a low delay during handoff. The pre-registratio...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04Q7/00H04Q7/20H04W8/26H04W12/02H04W12/06H04W36/14H04W36/24H04W80/04H04W84/04H04W84/12
CPCH04L63/0869H04W12/06H04L63/04H04W8/26H04W12/02H04W36/0016H04W80/04H04W12/062H04W36/14
Inventor BAE, EUN-HUISONG, O-SOKCHOI, SUNG-HOCHO, DONG-HOCHOI, HYUN-HO
Owner SAMSUNG ELECTRONICS CO LTD
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